Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 185 (IMMOBILIZER SYSTEM)SYSTEM CHECK
2002 Honda Civic Si
System Check
2002 Honda Civic SiSECTION System Check
WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.
- Connect the HDS to the data link connector.
- Turn the ignition switch ON (II).
- Monitor the System Check in the Immobilizer Info with the HDS.
- If the HDS displays the "Immobilizer system is normal", the immobilizer system is OK. If the HDS displays any other messages, check as follows:IMMOBILIZER SYSTEM CHECK AND POSSIBLE FAILURE DETAILS
Status Log No. System Check Possible Failures A-1 Immobilizer system is not normal - This key is not registered in the immobilizer unit. Try to register keys by using "KEYS".
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
A-2 Immobilizer system is not normal - Intermittent interruption between transponder and immobilizer unit.
- The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one.
- Key failure (transponder failure)
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
A-3 Immobilizer system is not normal - The ignition switch was turned on with a non-immobilizer key.
- The immobilizer key type is different. It is not for this vehicle but for another one or for other company's one.
- Key failure (transponder failure)
- The communication was not good between the antenna and the immobilizer key by influence of metal such as key chains.
- The communication was not good between the antenna and the immobilizer key by battery voltage low.
- Immobilizer unit failure
B-1 Immobilizer system is not normal - The PCM was not registered. Try to register the PCM by using "REPLACE PCM".
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
B-2 Immobilizer system is not normal - The PCM was not registered. Try to register the PCM by using "REPLACE PCM".
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
D-1 Immobilizer system is not normal - Harness short from the PCM to the immobilizer unit. (S-net line short)
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
- Immobilizer unit failure
- PCM failure
D-3 Immobilizer system is not normal - Blown fuse
- Harness open from the PCM to the immobilizer unit.
- The communication was not good between the PCM and the immobilizer unit by battery voltage low.
- The communication was not good between the immobilizer unit and the PCM by influence of some noise.
- Immobilizer unit failure
- PCM failure
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.